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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>span标签的使用</title>
</head>
<style type="text/css">
    p{font-size: 14px;}
    p .show,.bird span{font-size: 36px;font-weight: bold;color: blue;}
    p #dream{font-size: 24px;font-weight: bold;color: red;}
</style>
<body>
    <p>享受<span class="show">“24*7”</span>全天候服务</p>
    <p>在你身后，有一群人默默支持你成就<span id="dream">梦想</span></p>
    <p class="bird">选择<span>在线学习</span>，成就你的梦想</p>
</body>
</html>